diff --git a/service/ptos/head/ke/bugcheck.h b/service/ptos/head/ke/bugcheck.h
index 82dd702..7f37057 100644
--- a/service/ptos/head/ke/bugcheck.h
+++ b/service/ptos/head/ke/bugcheck.h
@@ -21,6 +21,7 @@
  * @BUGCHECK_EXCEPTION:     Fatal exception
  * @BUGCHECK_IRQL_NOT_GTE:  IRQL not greater than or equal
  * @BUGCHECK_IRQL_NOT_LTE:  IRQL not less than or equal
+ * @BUGCHECK_BAD_FREE:      Bad free operation
  */
 typedef enum {
     BUGCHECK_MISC,
@@ -29,7 +30,8 @@ typedef enum {
     BUGCHECK_UNBOUND_RESRC,
     BUGCHECK_EXCEPTION,
     BUGCHECK_IRQL_NOT_GTE,
-    BUGCHECK_IRQL_NOT_LTE
+    BUGCHECK_IRQL_NOT_LTE,
+    BUGCHECK_BAD_FREE
 } BUGCHECK_REASON;
 
 /*
diff --git a/service/ptos/ke/bugcheck.c b/service/ptos/ke/bugcheck.c
index 8d33b42..367c37a 100644
--- a/service/ptos/ke/bugcheck.c
+++ b/service/ptos/ke/bugcheck.c
@@ -38,7 +38,8 @@ static CHAR *ReasonTable[] = {
     [BUGCHECK_UNBOUND_RESRC] = "unbounded resource",
     [BUGCHECK_EXCEPTION] = "fatal exception",
     [BUGCHECK_IRQL_NOT_GTE] = "irql not greater than or equal",
-    [BUGCHECK_IRQL_NOT_LTE] = "irql not less than or equal"
+    [BUGCHECK_IRQL_NOT_LTE] = "irql not less than or equal",
+    [BUGCHECK_BAD_FREE] = "bad free"
 };
 
 VOID